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circRNA ID Gene Gene Type Strand (circRNA/Gene)
circRNA Type i

The back-fusion junctions (BFJs) of circRNAs from genic regions may have three possible positions relative to the nearest exon-intron boundaries of their cognate linear transcripts, giving rise to three circRNA subtypes:

(1) canonical (or completely boundary) circRNAs with both BFJs aligning to exon-intron boundaries;

(2) half interior (or half boundary) circRNAs with one, but not both, of the BFJs aligning to exon-intron boundaries;

(3) complete interior (or non-boundary) circRNAs with both junctions appearing inside of exons or introns.

Lariats are byproducts of splicing and can be regarded as variants of canonical circRNAs; for clarity, we list lariats separately here.

Intergenic circRNAs, derived from intergenic regions that often encode poorly annotated noncoding transcripts, can be considered a new distinct subtype of their own.

We collectively refer to complete interior, half interior, and intergenic circRNAs as noncanonical circRNAs (nc-circRNAs) to distinguish them from canonical circRNAs (c-circRNAs).

CircRNA Types Diagram
Position Length Species
9530068E07Rik/11:52294173-52294175-52293929-52293931-+/+ 9530068E07Rik protein_coding +/+ interior 11:52294173-52293929 244.0 Mouse
9530068E07Rik/11:52294312-52294313-52293990-52293991-+/+ 9530068E07Rik protein_coding +/+ interior 11:52294313-52293991 322.0 Mouse
9530068E07Rik/11:52298294-52298298-52298026-52298030-+/+ 9530068E07Rik protein_coding +/+ interior 11:52298298-52298030 268.0 Mouse
9530068E07Rik/11:52299247-52299250-52298562-52298565-+/+ 9530068E07Rik protein_coding +/+ interior 11:52299250-52298565 685.0 Mouse
9530068E07Rik/11:52299390-52299393-52298276-52298279-+/+ 9530068E07Rik protein_coding +/+ interior 11:52299390-52298276 1114.0 Mouse
9530068E07Rik/11:52299536-52299540-52298082-52298086-+/+ 9530068E07Rik protein_coding +/+ interior 11:52299536-52298082 1454.0 Mouse
9930021J03Rik/19:29730995-29730996-29763845-29763846--/- 9930021J03Rik protein_coding -/- interior 19:29730996-29763846 32850.0 Mouse
A330033J07Rik/13:48414701-48414704-48414599-48414602-+/- A330033J07Rik lncRNA +/- antisense 13:48414704-48414602 102.0 Mouse
A330033J07Rik/13:48414924-48414926-48414695-48414697-+/- A330033J07Rik lncRNA +/- antisense 13:48414926-48414697 229.0 Mouse
A430018G15Rik/2:52322933-52322934-52322390-52322391-+/+ A430018G15Rik lncRNA +/+ interior 2:52322934-52322391 543.0 Mouse